Net Control Requirements

Anyone within radio range
can be Network Control on the
CAVERN directed network!

ADVISORY: 2019.09.14 To operate as Network Control (aka “NetCon”) on the CAVERN network, your physical location MUST be able to reach CAVERN Repeater #1 via radio (on the Hill above Hobergs). If you cannot reach the repeater, you can still be a Relay for nearby CAVERN operators in your area and relay the check-in traffic for your group’s members.


1. Network Control: What You Need

Network Control Checklist:
√ GMRS Radio (higher watts, longer range, more features)
√ GMRS License + Callsign from the FCC ***
√ TUNE your GMRS Radio to Ch 15
√ BE ABLE to edit your GMRS radio’s “tones” to transmit:
     DCS Tone: D071N (CAVERN Standard Repeater Tone)
     CTCSS Tone: 103.5 Hertz (CAVERN Emergency Alert Tone)

Note: CAVERN can get you an FRS radio (no license required), and it will come pre-programmed with the CAVERN frequencies you need. We can also get you a GMRS radio (license required) pre-programmed with dozens of local Emergency Responder frequencies so you can listen in on radio traffic between Lake County Police, Ambulance, CalFire crews, Air Tankers, etc.

*** To get your GMRS license, either start at the FCC website (where you have to go anyway) or send email to CAVERN Network Control for help navigating the FCC process.


2. Network Control: An Example

Get the latest sample version of our Network Control script and read about how we have implemented our directed net. You can serve as “NetCon” for your neighbors in the event of a serious emergency.

Get the downloadable PDF at the Intro to Network Control page.

The purposes of this Volunteer Emergency Radio Network include:
ORGANIZING the community’s readiness.
PRACTICING radio communications.
MAINTAINING a state of readiness
so that we are prepared to talk to each other
in the event of an emergency.

5 thoughts on “Net Control Requirements”

  1. “privacy code” or CTCSS or PL tone of 103.5 is Hertz (!) – NOT Kilohertz

    please correct that !

  2. people need to be educated on what an “output” and/or “input” are
    and how to switch between them in case communicating party doesn’t understand why they’re not being received by the repeater.
    In many cases they can be heard on the input just fine by somebody who can relay…

    1. Our users are not radio experts, and aren’t required to know technical jargon to participate.

  3. From WikiPedia:

    Continuous Tone-Coded Squelch System or CTCSS is one type of circuit that is used to reduce the annoyance of listening to other users on a shared two-way radio communications channel. (See squelch.) It is sometimes referred to as tone squelch. It does this by adding a low frequency audio tone to the voice. Where more than one group of users is on the same radio frequency (called co-channel users), CTCSS circuitry mutes those users who are using a different CTCSS tone or no CTCSS. It is sometimes referred to as a sub-channel, but this is a misnomer because no additional channels are created. All users with different CTCSS tones on the same channel are still transmitting on the identical radio frequency, and their transmissions interfere with each other, however the interference is masked under most (but not all) conditions. The CTCSS feature also does not offer any security.

    A receiver with just a carrier or noise squelch unmutes for any sufficiently strong signal; in CTCSS mode it unmutes only when the signal also carries the correct sub-audible audio tone. The tones are not actually below the range of human hearing, but are poorly reproduced by most communications-grade speakers and in any event are usually filtered out before being sent to the speaker or headphone. CTCSS can be regarded as a form of in-band signaling.

  4. There are no words to show my appreciation!

    [Moderator’s Note: if you’re feeling charitable, there is one word… “donation”. ]

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